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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/ui/network_profile_bubble.h"
      6 
      7 #include <windows.h>
      8 
      9 #include <wtsapi32.h>
     10 // Make sure we link the wtsapi lib file in.
     11 #pragma comment(lib, "wtsapi32.lib")
     12 
     13 #include "base/bind.h"
     14 #include "base/command_line.h"
     15 #include "base/files/file_path.h"
     16 #include "base/files/file_util.h"
     17 #include "base/logging.h"
     18 #include "base/metrics/histogram.h"
     19 #include "base/prefs/pref_service.h"
     20 #include "base/time/time.h"
     21 #include "chrome/browser/browser_process.h"
     22 #include "chrome/browser/profiles/profile.h"
     23 #include "chrome/browser/ui/browser_finder.h"
     24 #include "chrome/browser/ui/browser_list.h"
     25 #include "chrome/browser/ui/browser_list_observer.h"
     26 #include "chrome/common/chrome_switches.h"
     27 #include "chrome/common/pref_names.h"
     28 #include "components/pref_registry/pref_registry_syncable.h"
     29 #include "content/public/browser/browser_thread.h"
     30 
     31 namespace {
     32 
     33 // The duration of the silent period before we start nagging the user again.
     34 const int kSilenceDurationDays = 100;
     35 
     36 // The number of warnings to be shown on consequtive starts of Chrome before the
     37 // silent period starts.
     38 const int kMaxWarnings = 2;
     39 
     40 // Implementation of chrome::BrowserListObserver used to wait for a browser
     41 // window.
     42 class BrowserListObserver : public chrome::BrowserListObserver {
     43  private:
     44   virtual ~BrowserListObserver();
     45 
     46   // Overridden from chrome::BrowserListObserver:
     47   virtual void OnBrowserAdded(Browser* browser) OVERRIDE;
     48   virtual void OnBrowserRemoved(Browser* browser) OVERRIDE;
     49   virtual void OnBrowserSetLastActive(Browser* browser) OVERRIDE;
     50 };
     51 
     52 BrowserListObserver::~BrowserListObserver() {
     53 }
     54 
     55 void BrowserListObserver::OnBrowserAdded(Browser* browser) {
     56 }
     57 
     58 void BrowserListObserver::OnBrowserRemoved(Browser* browser) {
     59 }
     60 
     61 void BrowserListObserver::OnBrowserSetLastActive(Browser* browser) {
     62   NetworkProfileBubble::ShowNotification(browser);
     63   // No need to observe anymore.
     64   BrowserList::RemoveObserver(this);
     65   delete this;
     66 }
     67 
     68 // The name of the UMA histogram collecting our stats.
     69 const char kMetricNetworkedProfileCheck[] = "NetworkedProfile.Check";
     70 
     71 }  // namespace
     72 
     73 // static
     74 bool NetworkProfileBubble::notification_shown_ = false;
     75 
     76 // static
     77 bool NetworkProfileBubble::ShouldCheckNetworkProfile(Profile* profile) {
     78   PrefService* prefs = profile->GetPrefs();
     79   if (prefs->GetInteger(prefs::kNetworkProfileWarningsLeft))
     80     return !notification_shown_;
     81   int64 last_check = prefs->GetInt64(prefs::kNetworkProfileLastWarningTime);
     82   base::TimeDelta time_since_last_check =
     83       base::Time::Now() - base::Time::FromTimeT(last_check);
     84   if (time_since_last_check.InDays() > kSilenceDurationDays) {
     85     prefs->SetInteger(prefs::kNetworkProfileWarningsLeft, kMaxWarnings);
     86     return !notification_shown_;
     87   }
     88   return false;
     89 }
     90 
     91 // static
     92 void NetworkProfileBubble::CheckNetworkProfile(
     93     const base::FilePath& profile_folder) {
     94   DCHECK_CURRENTLY_ON(content::BrowserThread::FILE);
     95   // On Windows notify the users if their profiles are located on a network
     96   // share as we don't officially support this setup yet.
     97   // However we don't want to bother users on Cytrix setups as those have no
     98   // real choice and their admins must be well aware of the risks associated.
     99   // Also the command line flag --no-network-profile-warning can stop this
    100   // warning from popping up. In this case we can skip the check to make the
    101   // start faster.
    102   // Collect a lot of stats along the way to see which cases do occur in the
    103   // wild often enough.
    104   if (CommandLine::ForCurrentProcess()->HasSwitch(
    105           switches::kNoNetworkProfileWarning)) {
    106     RecordUmaEvent(METRIC_CHECK_SUPPRESSED);
    107     return;
    108   }
    109 
    110   LPWSTR buffer = NULL;
    111   DWORD buffer_length = 0;
    112   // Checking for RDP is cheaper than checking for a network drive so do this
    113   // one first.
    114   if (!::WTSQuerySessionInformation(WTS_CURRENT_SERVER, WTS_CURRENT_SESSION,
    115                                     WTSClientProtocolType,
    116                                     &buffer, &buffer_length)) {
    117     RecordUmaEvent(METRIC_CHECK_FAILED);
    118     return;
    119   }
    120 
    121   unsigned short* type = reinterpret_cast<unsigned short*>(buffer);
    122   // We should warn the users if they have their profile on a network share only
    123   // if running on a local session.
    124   if (*type == WTS_PROTOCOL_TYPE_CONSOLE) {
    125     bool profile_on_network = false;
    126     if (!profile_folder.empty()) {
    127       base::FilePath temp_file;
    128       // Try to create some non-empty temp file in the profile dir and use
    129       // it to check if there is a reparse-point free path to it.
    130       if (base::CreateTemporaryFileInDir(profile_folder, &temp_file) &&
    131           (base::WriteFile(temp_file, ".", 1) == 1)) {
    132         base::FilePath normalized_temp_file;
    133         if (!base::NormalizeFilePath(temp_file, &normalized_temp_file))
    134           profile_on_network = true;
    135       } else {
    136         RecordUmaEvent(METRIC_CHECK_IO_FAILED);
    137       }
    138       base::DeleteFile(temp_file, false);
    139     }
    140     if (profile_on_network) {
    141       RecordUmaEvent(METRIC_PROFILE_ON_NETWORK);
    142       content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
    143           base::Bind(&NotifyNetworkProfileDetected));
    144     } else {
    145       RecordUmaEvent(METRIC_PROFILE_NOT_ON_NETWORK);
    146     }
    147   } else {
    148     RecordUmaEvent(METRIC_REMOTE_SESSION);
    149   }
    150 
    151   ::WTSFreeMemory(buffer);
    152 }
    153 
    154 // static
    155 void NetworkProfileBubble::SetNotificationShown(bool shown) {
    156   notification_shown_ = shown;
    157 }
    158 
    159 // static
    160 void NetworkProfileBubble::RegisterProfilePrefs(
    161     user_prefs::PrefRegistrySyncable* registry) {
    162   registry->RegisterIntegerPref(
    163       prefs::kNetworkProfileWarningsLeft,
    164       kMaxWarnings,
    165       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
    166   registry->RegisterInt64Pref(
    167       prefs::kNetworkProfileLastWarningTime,
    168       0,
    169       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
    170 }
    171 
    172 // static
    173 void NetworkProfileBubble::RecordUmaEvent(MetricNetworkedProfileCheck event) {
    174   UMA_HISTOGRAM_ENUMERATION(kMetricNetworkedProfileCheck,
    175                             event,
    176                             METRIC_NETWORKED_PROFILE_CHECK_SIZE);
    177 }
    178 
    179 // static
    180 void NetworkProfileBubble::NotifyNetworkProfileDetected() {
    181   Browser* browser = chrome::FindLastActiveWithHostDesktopType(
    182       chrome::GetActiveDesktop());
    183 
    184   if (browser)
    185     ShowNotification(browser);
    186   else
    187     BrowserList::AddObserver(new BrowserListObserver());
    188 }
    189